The black HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens from Pentax is a high performance standard length zoom lens for K-mount APS-C cameras. Its 35mm focal length equivalency is 30.5-61.5mm providing a versatile and practical range for wide-angle to standard length shooting. It is the first zoom lens in the Pentax Limited Series line and brings with it a durable, weather-sealed body, HD lens coating and an optical design consisting of one ED element and one super-low dispersion element.
The f/2.8-4 maximum aperture enables effective low light shooting and, at the wide-angle end, control over its shallow depth of field for images that place sharp focus on the subject with a pleasing out of focus background. An in-lens direct current (DC) focus motor provides smooth and quiet autofocus action and its Quick-Shift Focus System enables rapid shift from autofocus to manual focus mode.
The lens barrel and the included hood are made from high-grade aluminum alloy, distance and depth of field scales are clearly marked on the barrel and a smooth rotating, knurled ring provides manual focus control. SP (Super Protect) coating on the front and rear lens elements repels dust, water and grease to help maintain peak performance.
Brand | Pentax |
---|---|
Focal Length | 20 - 40mm Comparable 35mm Focal Length: 30.5 - 61.5 mm |
Focal Length | 20 - 40mm; Comparable 35mm Focal Length: 30.5 - 61.5 mm |
Aperture Range | Maximum: f/2.8 - 4 Minimum: f/22 - 32 |
Aperture | Maximum: f/2.8 - 4; Minimum: f/22 - 32 |
Camera Mount | Pentax K |
Camera Mount Type | Pentax K |
Format Compatibility | Pentax Digital (APS-C) |
Lens Format | Pentax Digital (APS-C) |
Angle of View | 70 - 39 |
Minimum Focusing Distance | 11.02“ (28 cm) |
Tilt | None |
Focus Type | Autofocus |
Minimum Focus Distance | 28 cm |
Image Stabilizer | No |
Magnification | 0.20x |
Angle Of View | 70 - 39 |
Elements/Groups | 9/8 |
Groups | 8 |
Diaphragm Blades | 9 |
Diaphragm Blades | 9 |
Image Stabilization | No |
Filter Size | Front:55 mm |
Autofocus | Yes |
Tripod Collar | No |
Tripod Collar | No |
Elements | 9 |
Filter Thread | Front:55 mm |
Dimensions (Diam. x L) | 71 x 69 mm |
Dimensions (DxL) | Approx. 2.80 x 2.72“ (71 x 69 mm) |
Weight | 283 |
Weight | 283 |
Focal Length | 20 to 40mm Comparable 35mm Focal Length: 30.5 to 61.5 mm |
Filter Thread Size | Front: 55 mm |
Dimensions(DxL) | 71 x 69 mm |
Weight | 283 g |
Tripod Collar | No |
Autofocus | Yes |
Aperture | Maximum: f/2.8 to 4 Minimum: f/22 to 32 |
Camera Mount Type | Pentax K |
Format Compatibility | Pentax Digital (APS-C) |
Angle of View | 70 to 39 |
Minimum Focus Distance | 28 cm |
Magnification | 0.20x |
Maximum Reproduction Ratio | 1:5 |
Optical Design | 9 Elements in 8 Groups |
Diaphragm Blades | 9 |
Image Stabilization | No |
Tilt/Shift | None |